Overview
In this chapter we discuss the general aspects of the longitudinal development of air showers and the effects of the primary energy and mass. These are based on the fundamental processes treated in detail in Chaps. 3, 4 and 5. However, the current chapter can in principle be studied without the full knowledge of the contents of the previous chapters, but some knowledge of hadronic and electromagnetic interactions is useful. Examples of simulated longitudinal shower profiles and the effect of the radiation length are presented. We then outline the longitudinal and lateral energy deposit profile of the different shower constituents in the atmosphere. This is followed by the definition of the shower rate attenuation and shower particle absorption. The absorption and attenuation lengths and coefficients are introduced, the relation of these quantities to the nucleon spectrum in the atmosphere and the mathematical expressions that link the observables are explained. Subsequently, the altitude and zenith angle dependence, and the influence of environmental parameters on the shower rate and the particle flux in showers are summarized. Experimental methods to access these quantities are discussed and data of the shower attenuation rate, the absorption of shower particles, the zenith angle dependence and of the environmental effects are discussed at some length. Finally, the concept of equal intensity cuts and distributions which offer deeper insight into the longitudinal development of showers are introduced and data samples presented.
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Notes
- 1.
Of particular interest are the energy dependent inelastic cross sections for collisions of nucleons, pions and other hadrons, such as nuclei, with nuclei of air constituents, \(\sigma^{N,A}_{\mathrm{inel}}, \ \sigma^{\pi,A}_{\mathrm{inel}}\), etc., where A stands for 14N or 16O.
- 2.
The energy dependence of the secondary particle multiplicity is discussed in Sect. 3.5.
- 3.
For a detailed discussion on the leading particle effect, elasticity and inelasticity see Sect. 3.8.
- 4.
In spite of the fact that muons do not generate a cascade themselves, but represent so-to-say an extension of the history of the hadron cascade into the deeper atmosphere where they exhibit a shower like behavior when analyzed with a detector array, we use the term hadron–muon cascade in place of hadron cascade and associated muon shower .
- 5.
This program system, called ASICO, was the forerunner of today’s widely used CORSIKA program (Capdevielle et al., 1992; Heck et al., 1998a, b; Heck and Knapp, 2002). The two programs have essentially identical structures, however, an extended choice of modern interaction models (event generators) is now available with CORSIKA (for details see Chap. 20).
- 6.
Different authors use different values for χ 0. In older work 36.66 g cm−2 was frequently used; today a value of 37.1 g cm−2 is recommended.
- 7.
In the literature there is no clear-cut terminology. Attenuation length as well as absorption length are used for shower rate attenuation and/or shower particle absorption, and likewise for Λ and λ.
- 8.
We disregard the steepening of the spectrum beyond the so-called knee.
- 9.
We write N instead of N e in this case since experimentally the distinction between the electron size, N e , and the total shower size, N, which includes all particles, is made only in a few experiments, e.g., in KASCADE (Antoni et al., 2003).
- 10.
Charmed particles are little affected by the changing density because of their very short mean life.
- 11.
It is assumed that the primary composition remains constant; if energy dependent it affects the shower development.
- 12.
Kaons affect the shower development alike but play an inferior role because they are much less abundant. Because of the very short mean life of charmed particles and the high production threshold energy their contribution to the high energy muon flux at ground level is essentially independent of zenith angle.
- 13.
For zenith angles \(\theta \geq (70^{\circ}-80^{\circ})\), depending on the accuracy required, the Chapman function must be used to compute the atmospheric column density along the trajectory correctly.
- 14.
The muon content in muon-poor showers amounts to about 1% or less of all the particles.
- 15.
Note that in this experiment the electron component can be separated from the bulk of all-charged particles.
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Grieder, P.K. (2010). Longitudinal Development and Equal Intensity Distributions. In: Extensive Air Showers. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-76941-5_6
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